PHOTOOXYGENATION OF CAFFEINE SENSITIZED BY HYPOCRELLIN B

摘要

The photooxygenation of caffeine sensitized by Hypocrellin B in alcohol solvents hasbeen investigated in this paper. The products have been isolated and identified. The mainproduct is 8--alkoxyl substituted caffeine derivatives. Deuterium. oxygen partial pressure andNaN₃-quenching experiments indicate that the reaction proceeds on singlet oxygen mechanism.